Turbine shroud assembly with ceramic matrix composite components having stress-reduced pin attachment

Abstract

A turbine shroud assembly is adapted to extend around a turbine wheel mounted for rotation about a central reference axis of a gas turbine engine. The turbine shroud assembly includes a carrier segment made from metallic materials and a blade track segment made from ceramic matrix composite materials. The carrier extends at least partway about the axis. The blade track segment is supported by the carrier radially relative to the axis to define a portion of a gas path of the assembly.

What is claimed is: 
     
       1. A turbine shroud assembly adapted to extend around a turbine wheel mounted for rotation about a central reference axis, the turbine shroud assembly comprising
 a carrier segment made from metallic materials, 
 a blade track segment made from ceramic matrix composite materials, the blade track segment shaped to include a runner that faces radially inward toward the central reference axis, a first attachment flange that extends radially outward from the runner, and a second attachment flange that extends radially outward from the runner at a location spaced axially from the first attachment flange to establish a confronting face that faces toward the first attachment flange and an opposing face that faces away from the first attachment flange, and 
 a mount pin that extends from the carrier segment through a first pin passage formed through the first attachment flange and a second pin passage formed through the second attachment flange to couple the blade track segment to the carrier segment, the mount pin shaped to include a first terminal end, a second terminal end spaced apart axially from the first terminal end, and an outer surface that extends between the first and second terminal ends, 
 wherein one of the confronting face and the opposing face of the second attachment flange is formed to include a countersink around the second pin passage configured to reduce stress induced in the blade track segment by bending of the mount pin upon loading of the blade track segment radially inward during use of the turbine shroud assembly in the gas turbine engine, and 
 wherein the first and second terminal ends of the mount pin are each spaced apart axially from the countersink and a portion of the outer surface of the mount pin that is located in the second pin passage is spaced apart from the countersink. 
 
     
     
       2. The assembly of  claim 1 , wherein the first attachment flange has a confronting face that faces toward the second attachment flange and an opposing face that faces away from the second attachment flange, and one of the confronting face and the opposing face of the first attachment flange is formed to include a countersink around the first pin passage. 
     
     
       3. The assembly of  claim 2 , wherein the carrier segment includes a first carrier flange arranged adjacent to the first attachment flange of the blade track segment and a second carrier flange arranged adjacent to the second attachment flange of the blade track segment. 
     
     
       4. The assembly of  claim 3 , wherein each countersink is formed in the opposing face of the respective attachment flange of the blade track segment. 
     
     
       5. The assembly of  claim 4 , wherein the mount pin extends at least partway into the first carrier flange and into the second carrier flange. 
     
     
       6. The assembly of  claim 5 , wherein the first carrier flange is located axially forward of the first attachment flange of the blade track segment and the second carrier flange is located axially aft of the second attachment flange of the blade track segment so that both the first attachment flange and the second attachment flange are located axially between the first carrier flange and the second carrier flange. 
     
     
       7. The assembly of  claim 2 , wherein the carrier segment includes a carrier flange arranged axially between the first attachment flange and the second attachment flange of the blade track segment and each countersink is formed in the confronting face of the respective attachment flange. 
     
     
       8. The assembly of  claim 7 , wherein the mount pin extends through the first attachment flange of the blade track segment, the carrier flange of the carrier segment, and the second attachment flange of the blade track segment. 
     
     
       9. The assembly of  claim 2 , wherein the carrier segment includes a first carrier flange located axially forward of the first attachment flange of the blade track segment and a second carrier flange located axially aft of the second attachment flange of the blade track segment so that both the first attachment flange and the second attachment flange are located axially between the first carrier flange and the second carrier flange,
 wherein the first carrier flange is formed to include a first pin-receiving aperture and the second carrier flange is formed to include a second pin-receiving aperture, the first terminal end of the mount pin is located in the first pin-receiving aperture and the second terminal end of the mount pin is located in the pin-receiving aperture, and 
 wherein each countersink is formed in the opposing face of the respective attachment flange of the blade track segment. 
 
     
     
       10. The assembly of  claim 2 , wherein the carrier segment includes a first carrier flange located axially forward of the first attachment flange of the blade track segment, a second carrier flange located axially aft of the second attachment flange of the blade track segment so that both the first attachment flange and the second attachment flange are located axially between the first carrier flange and the second carrier flange, and an intermediate carrier flange located axially between the first attachment flange and the second attachment flange,
 wherein the first carrier flange is located axially forward of the first terminal end of the mount pin, the second carrier flange is located axially aft of the second terminal end of the mount pin, and the first and second terminal ends are spaced apart axially from the first and second carrier flanges, and 
 wherein each countersink is formed in the confronting face of the respective attachment flange of the blade track segment. 
 
     
     
       11. The assembly of  claim 1 , wherein the carrier segment includes a first carrier flange located axially forward of the second attachment flange of the blade track segment and a second carrier flange located axially aft of the second attachment flange of the blade track segment so that both the second attachment flange is located axially between the first carrier flange and the second carrier flange,
 wherein the countersink is formed in the confronting face of the second attachment flange of the blade track segment. 
 
     
     
       12. An assembly adapted for use in a gas turbine engine, the assembly comprising
 a carrier component made from metallic materials and arranged to extend at least partway around a central reference axis, 
 a heat shield component made from ceramic matrix composite materials, the heat shield shaped to include a shield panel configured to face a primary gas path of the gas turbine engine, a first attachment flange that extends radially from the shield panel, and a second attachment flange that extends radially from the shield panel at a location spaced axially from the first attachment flange to establish a confronting face that faces toward the first attachment flange and an opposing face that faces away from the first attachment flange, and 
 a mount pin that extends from the carrier component through a first pin passage formed through the first attachment flange and a second pin passage formed through the second attachment flange of the heat shield component to couple the heat shield component to the carrier component, the mount pin shaped to include a first terminal end and a second terminal end spaced apart axially from the first terminal end, 
 wherein one of the confronting face and the opposing face of the second attachment flange is formed to include a countersink around the second pin passage configured to reduce stress induced in the heat shield component by bending of the mount pin upon loading of the heat shield component radially away from the carrier component, and 
 wherein the first and second terminal ends of the mount pin are each spaced apart axially from the countersink. 
 
     
     
       13. The assembly of  claim 12 , wherein the first attachment flange has a confronting face that faces toward the second attachment flange and an opposing face that faces away from the second attachment flange, and wherein one of the confronting face and the opposing face of the first attachment flange is formed to include a countersink around the first pin passage configured to reduce stress induced in the heat shield component by bending of the mount pin upon loading of the heat shield component radially away from the carrier component. 
     
     
       14. The assembly of  claim 13 , wherein the carrier component includes a carrier flange arranged axially between the first attachment flange and the second attachment flange of the heat shield component and each countersink is formed in the confronting face of the respective attachment flange. 
     
     
       15. The assembly of  claim 14 , wherein the mount pin extends through the first attachment flange of the heat shield component, the carrier flange of the carrier component, and the second attachment flange of the heat shield component. 
     
     
       16. The assembly of  claim 13 , wherein the carrier component includes a first carrier flange arranged adjacent to the first attachment flange of the heat shield component and a second carrier flange arranged adjacent to the second attachment flange of the heat shield component. 
     
     
       17. The assembly of  claim 16 , wherein each countersink is formed in the opposing face of the respective attachment flange of the heat shield component. 
     
     
       18. The assembly of  claim 17 , wherein the mount pin extends at least partway into the first carrier flange and the second carrier flange. 
     
     
       19. The assembly of  claim 18 , wherein the first carrier flange is located axially forward of the first attachment flange of the heat shield component and the second carrier flange is located axially aft of the second attachment flange of the heat shield component so that both the first attachment flange and the second attachment flange are located axially between the first carrier flange and the second carrier flange. 
     
     
       20. The assembly of  claim 12 , wherein the mount pin is shaped include an outer surface that extends between the first and second terminal ends and a portion of the outer surface of the mount pin that is located in the second pin passage is spaced apart from the countersink.